You may run DIGITtally on a list of genes you're already interested in, to see how "interesting" each looks in your selected tissue set. Genelists can be built using the "Build Genelist" option from the "Other Utilities" menu
Change Data Source Weighting
These options change the relative weighting of scores from each data source - ie, if you set FlyAtlas1 to 1 and Flyatlas2 to 2, scores from FlyAtlas2 will contribute twice as much to your DIGITtally.
Please note, if you set a weight to 0, that data source will no longer be used.